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Photograph of typical thermokarst feature in the Noatak Valley, Alaska.
Old carbon loss and its relationship to total ecosystem respiration for three sites that differ in the extent of permafrost thaw. Growing-season loss of old C from deeper in the soil profile, based on statistical partitioning estimates of mean proportional old C loss multiplied by ecosystem respiration (Reco) flux measurements. Error bars represent the spatial variability of Reco fluxes. The relationship between total Reco and proportional old C loss for the growing season across sites. Error bars represent the interannual variability in C loss estimates; the regression line is shown for n=3 sites.